See image. The blue & orange curves represent + ultimate load factor curves for the shorter, lighter model of a type. The grey and yellow is for the longer, heavier model of the same type for which I just have some tabulated data. Both derivatives share common cg (x394). The shorter model distribution makes sense. The grey curve for the longer model makes sense too given the higher mass moment of inertia. But I don't understand the sudden change in the three last data points represented by the yellow curve. The tabulated maximum ultimate loads for the longer model are all given from the same yz axis. The slope change does occur just forward of the t-tail horizontal stabilizer.
I think I'm missing something fundamental here - is it obvious to others?
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